Transmission of signals.



No. 849,919. PATENTED APR. 9,- 1907.

A. PERRIN.

TRANSMISSION OF SIGNALS. APPLICATION FILED my 23, 1904.

8 SHEETS-SHEET 1.

.No.s49,919.

A. PERRIN.

TRANSMISSION OF SIGNALS.

APPLICATION FILED HAY 23, 1904.

PATENTED APR. 9, 1907.

6 SHEETS-BHEBT'2.

a v A AWWKM Q No. 849,919. PATENTED APR. 9, 1907. I A. PERRIN.

TRANSMISSION OF SIGNALS.

APPLICATION FILED MAY 23/1904.

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' PATENTED APR. 9, 1907. A. PERRIN.

TRANSMISSION OF SIGNALS.

APPLICATION 11.31). MAY 23, 1904.

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TRANSMISSION OF SIGNALS.

APPLICATION FILED IAY B3, 1904.

6 SHEETS-SHEET 6.

IINIIIH lllllllll' i/mea'm/ 5T J UNITED I STATES I ALFRED PERRlN, OF GRENOBLE, FRANCE.

TRANSMISSION OF SIGNALS.

' To all whom it may concern:

Be it known that I, ALFRED PERRIN, engineer, a citizen of the French Republic, residing at Grenoble, Isere, France, have invented certain new and useful Im rovements in the Transmission of Signals, which the followin is a specification.

This invention has for its object a new system of transmission of signals from or to any disfances, and is based on the following princip e.

.A system constituted by a piece which is set in oscillation and insures an electrical contact for each oscillation is said to be synchronous with an ordinary pendulum' or with a pendulum consistin of an elastic blade loaded at its free end, w en the interval between two electrical contacts corresponds to the du-' ration of a double period of oscillation of the pendulum. If a simple pendulum or an elastic pendulum be subjected to electrical contacts that are synchronous with its period of oscillation, the amplitude of its oscillations increases to such an extent that it becomes sufficient to roduce mechanical effects if the mass of t e pendulum is sufficiently lar e. These mechanical efiects can be amplified y any known means such, for instance, as an electroma et actin as a relay. If, on the contrary,t esystem asynchronous,the amplitude does not exceed a small value and no mechanical effect is obtained. If, therefore, several pendulums are subjected to a system of electrical contacts, the pendulum which is synchronous with the electrical-contacts system will alone oscillate with an amplitude sufficient to produce mechanical work.

In order to transmit signals in accordance with this principle, it issufiicient to have at the sending-stat1onsa certain number of pen dulums whose periods of oscillations are perceptibly different and to arrange at the recelving-station the same number of endulums, each of which corresponds to a li e pen.- dulum at the sending-statlon. On acting on one of the pendulums at the sending-station a suitable arrangement breaks and makes a circuit which roduces at regular intervals attractions on t e pendulums at the receivingoflice. The pendulum of the receiving-station which issynchionous with the corresponding endulum at the sending-station will then e the onlyone that will have an amplitude of oscillation sufficient to produce 5 5 the required mechanical efiect, such as'the release of a shield on an indicator-board.

Specification of Letters Patent. I Application filed May 23,1904. Serial No. 209.406.

Patented April 9, 1907.

The movement of the pendulums in the receiving-station may be obtained by one or more electromagnets acting on a frame carrying the pendulums. In the case of very slow oscillating pendulums the movement may be produced by expansible wires heated by the current and acting on the frame carrying the pendulums. The receiving-station may be operated by wireless telegraphy, provided the vibration of the coherer is very ra id relatively to the periods of oscillations of ishe pendulums used.

This invention will be readily understood by referring to the accompanying drawings, in which Figure 1 shows by way of exam le a front view of the receiving apparatus 0 an apartment-annunciator. Figs. 3, 4, 5, and 6 are details. Figs. 7, 8, 9, 10, 11, and 12 are modifications. Figs. 13 211M114 show an elevation and an end view of the sending apparatus. Figs. 15 and 16 show an elevation and an end view of a modi fication of the sending apparatus, while Fig. 17 is a diagram of the circuit connections. Fig. 18 is a diagrammatic view of a sendingstation for wireless transmission. Fig. 19 is a diagrammatic view of a receiving-station for the application of the system to Wireless Fig. 2 is an end view.

telegraphy. Fig. 20 is a diagram of the circuit connections or joined apparatuses embod ing the features of the invention.

ereceiving apparatus, Figs. 1 and 2, comprises an electromagnet a, the armature b of which carries a frame 0, to whichare attached elastic pendulums d, d, (1 d 11, and (1 which are arranged in pairs on each of the three branchesof the frame, as shown by Fig. 1 of the drawings.

The frame has the shape of an inverted W, each branch of which carries pendulums which are so arranged that the movement of the. framing under the attraction of the electromagnet takes place in the plane of oscillation of the pendulums.

In order to decrease the height of the apparatus, the electromagnet a might be arranged below the armature b, as shown in Fig. 7. i

The elastic pendulum (1, set in motion by the corresponding synchronous pendulum of the sending-statiomcauses a number-plate of a small plate of sheet metal e capable of sliding in a support f. -This small plate carries a projection g, resting on the support f and pre\ 'entin'g the small plate from dropping. hen the pendulum vibrates, the sniall plate will he repelled toward the left and drop. The small plate is also provided with a notch l1 opposite the hammer of the penduluni. hen the small plate has dropped, the notch is no longer opposite the hammer of the pendulum, which is thereby held stationar Figs. 8, 1), 1t), and 11 show a modification comprising a single support for two numberplates.

Nundwr-plates capable of being tilted may also be used, hig. 12. 'hen at rest, they are in a state of unstable equilibrium and the least vibration causes them to tilt over. An arm i serves to raise tl1en1 again, while an eccentric stops the oscillations of the pendulum when the number-plate is tilted. The number-plates are raised again by a kind of fork Ir, Figs. 1, 2, and 6, which is shown in the drawings as being at the top of its upstroke. The fork 7c is used for receiving the number-plates which fall by the action of the respective pcndulmns cooperating therewith. \"Yhen at rest, the said fork k is in the position shown in dotted lines in Fig. 1. hen a number-plate has fallen or dropped, the operatoror person who received the signal grasps the handle '11 of the fork and raises the latter in the position shown in full lines in Fig. 1. The fork is provided with branches, as will be hereinafter set forth, corresprn1ding to the various number-plates, and the branch correspomling to the plate which has fal en acts upon the said plate and brings it into normal position. in Fig. 5 of the drawings the number-plate corresponding to the pendulum d only has been shown in order to facilitate a clear understanding of the drawings and the invention; but it is to be understood that each pendulum is supplied with a corresponding number-plate. This fork comes down again by virtue of its own gravity when the number-plates have been put back in their'places and the fork is no longer acted on. This fork is provided with as many branches as there are numberplates. As the frame carries its pendulums, there are accordingly siX number-plates, and the fork 7c is provided with six branches m, m, m m m and m which each correspond to a number-plate. The fork k slides on the plate A, carrying pins B, engaged in grooves C of the fork. By raising the fork is in the position shown by Fig. 1 and acting on the pendulum-rod p the branches m, 111, m m m, and act, respectively, on the numberplates which have fallen and raise them. lVhen the number-plates are raised, the'fork is released, and falls to normal position by its own weight. Each branch raises the dropped number-plate corresponding to it.

As regards the number-plates SllOWIlulll Figs. 3 and 5, these are raised by the branch acting on the lower left-hand corner, so that they are tilled slightly to the right and permit of the'projection g engaging with the notch f. To raise again the fork, the handle 12 thereof and a fixed knob (not shown in the drawings) are. held between the thumb and i11dex-linger and brought close together. The transmission apparatus at the sending-station, Figs. 13, 14, 15, and 1-6, consistseachof a piece of steel 0, cut out and stamped so as to form therein, lirst, a pendulum-rod p, to which is fixed the bob or hammer q; second, a releasing-spring 1', which causes the hammer to vibrate when pressure is exerted at a suitable point thereof, and, third, a lever s,in--

tended to strike against a contact so as to make and break a circuit. This lever s is caused to participate in the oscillations of the pendulum by the narrow part t and also am plifies the displacement of the part 25. A wire is attached to the steel plate 0 and also tothe contact u, as clearly shown by Figs. 13, 14,

15, and 16. It is advisable to give to the support of the transmission apparatus a slight elevation toward the center of the narrow part t and below it. It will thus be possible by pressing on the spring 1" to slightly raise the lever s so that the contact is made so long as the transmission apparatus is being operated regularly, when the oscillations of the pendulum are of small amplitude.

For the call-bell of the annunciator an ordinary hell with interrupter may be used. In this case the bell is included in aspecial circuit, as shown in Fig. 17.

A wire 1) starts from the positive pole of the battery and is connected by shunt-circuits, including the transmission apparatus of the sending-station to the electromagnet of the receiving-station. Another wire w connects one of the negative poles of the battery to the electromagnet a and frame 0. A third wire a: in series with the bell runs from the last negative plate of the battery to the contact y, against which the frame 0 strikes when it is attracted by the electromagnet, thereby closin the circuit of the bell and causing the bel to ring.

A slight difference between the sending and receiving endulums is of no importance. It is possible i a great number of numbers are requ1redsay twenty-four-to join together four apparatus comprising each six pendulums, as shown by Fig. 20. It will therefore sufficeto have four outgoing wires and one return-wirein all five or six wires, according to the connections of the bell, instead of the twenty-seven wires now used in con-- nection with the ordinary annunciators. This arrangement has many advantages as regards its simplicity of construction and the small number of wires and electromagnets required.

' The ap aratus may be used in connection with wireless telegraphy.

In the sending station the operation of keys 1 causes a current to pass into the primark circuit of the coil 2. (See Figs. 18 and 19.) Through the medium of Hertzian radiations, by means of the rods 3 and 4, the co: herer 5 operates as a conducting medium and causes the current to pass therethrough and establish the circuit 6. Such passage of the current and the establishment of the circuit specified actuates the electromagnet 8 and causes the armature 7 to be attracted thereto. This attraction of the armature to the electromagnet closes the circuit 9 and sets up an operation of the signaling system. At the same time the armature 10 of the electromagnet 11 is attracted to the latter and ceases to act as a brake on the toothed Wheel 12. This toothed wheel is operated by suitable clockwork 13 and when free to rotate strikes the coherer and obstructs the conductivity of the latter. 7

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that What I claim is- A method of transmitting mechanical signals consistin in causing one frame carrying different pe'n ulums at a receivin station to be oscillated by pendulums sync onous to the first pendulums and situated at sendingstations, each pendulum of the receiving' station oscillating with the synchronous corr'es ondingpendulum of a sending-station.

n testimony whereof I have hereunto setmy hand in presence of two subscribing witnesses.

- ALFRED PERRIN. Witnesses:

v vJOHN GILLEAUr, PAUL FRANZ Moon-1A9 

